Title: Boildown Study on Supernatant Liquid Retrieved from AW-106 in December 2012

Abstract

This document reports the results of a boil down study using a composite created from supernatant liquid grab samples retrieved from tank 241-AW-I06 in December of 2012. The composite was made using predetermined volumes of the grab samples which accounted for layering of the supernatant liquid in the tank. The finished composite was a clear, yellow liquid containing no visible solids at hot cell ambient temperatures (24 - 27°C). The density of the test composite was measured in the hot cell immediately before the boildown study and was 1.266 g/mL at 27.1 °C. The boiling temperature of the composite was measured at three different pressures (40, 60, and 80 Torr) throughout the volume reduction, and the results show steadily increasing boiling temperatures with increasing volume reduction and no significant discontinuities. Moderate foaming was observed at the onset of the boildown. The foaming disappeared during the first reduction step, and minimal foaming was observed throughout the rest of the study. The bulk densities at 18.0 °C (D{sub Bulk}{sup 18 °C}) and quantities of settled and centrifuged solids were measured on samples of the boildown concentrates. Estimated values of the bulk densities at the 60-Torr boiling temperatures (D{sub Bulk}{sup 60 Torr}) weremore » also calculated. Solids were first observed at boildown temperatures when the % VWR reached 39.3%. The quantity of solids in the composite quickly increased after this initial formation; the amount of centrifuged solids increased by 22% as the %WVR increased from 39.3 to 44.1 %. A small amount of solids did appear in the samples collected prior to the initial formation during the boildown. These solids precipitated while they sat at hot cell ambient temperature and in the 18. 0 °C water bath. Analysis of boil down test samples indicated that natrophosphate (Na7{sub 3}F(PO{sub 4}){sub 2}{centerdot} 19 H{sub 2}O) and kogarkoite (Na3FS04) accounted for a majority of the initial solids (~80% of the dissolved sulfate and phosphate precipitated from the composite by 44.1 % WVR). The large increase in solids at 44.1 % WVR was dominated by sodium nitrate and sodium carbonate.« less

Authors:

Page, Jason S. ^[1]

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+ Show Author Affiliations

1. Washington River Protection Solutions, LLC, Richland, WA (United States)

Publication Date:

Tue Jun 04 00:00:00 EDT 2013

Research Org.:

Hanford Site (HNF), Richland, WA (United States)

Sponsoring Org.:

USDOE Office of Environmental Management (EM) (United States)

OSTI Identifier:

1082481

Report Number(s):

LAB-RPT-13-00003 Rev 0
TRN: US1300144

DOE Contract Number:  

DE-AC27-08RV14800

Resource Type:

Technical Report

Country of Publication:

United States

Language:

English

Subject:

12 MANAGEMENT OF RADIOACTIVE AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES